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Titre : | Amputee Locomotion: Determining the Inertial Properties of Running-Specific Prostheses (2013) |
Auteurs : | Brian Baum ; Mélanie Schultz ; Andrea Tian ; et al. |
Type de document : | Article |
Dans : | Archives of Physical Medicine and Rehabilitation (2013/9, 2013) |
Article en page(s) : | pp. 1776-1783 |
Langues: | Anglais |
Descripteurs : |
HE Vinci Amputation ; Prothèses et implants ; Rééducation et réadaptation |
Mots-clés: | Prostheses and implants |
Résumé : |
Objectives (1) To test the validity of a trifilar pendulum in estimating moments of inertia (MOIs) for running-specific prostheses (RSPs), (2) to measure inertial properties (mass, center of mass [CM] position, and MOIs) for 4 RSPs, (3) to verify the influence of the stiffness on the inertial properties of RSPs, and (4) to develop a predictive equation to estimate RSP CM positions. Design An aluminum block with known MOIs was used for verifying the accuracy of the trifilar pendulum MOI measurements. MOI errors were investigated by systematically misaligning the block and pendulum principal axes across a range of 1 to 10cm. Mass, CM position, and MOI were tested across 4 RSP designs with 3 stiffness categories each. Setting University biomechanics laboratory. Specimens Four different RSP designs and 3 stiffness categories per design were examined. Interventions Not applicable. Main Outcome Measures MOI errors from known values and principal axis misalignments between RSPs and pendulum; mass, CM positions, and RSP principal axis MOIs; and predictive equation CM position errors. Results The trifilar pendulum estimated MOIs within −6.21*10−5kg/m2 (≤1% error) for a block with known MOIs. Misalignments of 1 to 5cm between the RSPs' and pendulum's CM yielded errors from .00002 to .00113 kg/m2 (0.3%−59.2%). Each RSP's inertial properties are presented. MOIs about any axis varied <.004kg across stiffness categories mois differed up to .013kg between different designs. the predictive cm equation erred .010 and .028m when using average input values an rsp design.> Conclusions Trifilar pendulums can accurately measure RSP MOI. The RSP inertial properties differed slightly across stiffness categories within each design, but differed more substantially across different RSP designs. Using a predictive equation to estimate RSP CM positions can provide adequate data, but directly measuring CM positions is preferable. |
Disponible en ligne : | Oui |
En ligne : | https://login.ezproxy.vinci.be/login?url=https://www.sciencedirect.com/journal/archives-of-physical-medicine-and-rehabilitation |